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// Copyright (c) 2017 Levon Tarakchyan
//
// Distributed under the Boost Software License, Version 1.0. (See
// accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
#include "boost/config.hpp"
#include "boost/core/lightweight_test.hpp"
#include "boost/variant.hpp"
#include "boost/variant/apply_visitor.hpp"
#include "boost/variant/multivisitors.hpp"
#include "boost/lexical_cast.hpp"
#define lcs(val) boost::lexical_cast<std::string>(val)
struct construction_logger
{
int val_;
construction_logger(int val) : val_(val)
{
std::cout << val_ << " constructed\n";
}
construction_logger(const construction_logger& cl) :
val_(cl.val_)
{
std::cout << val_ << " copy constructed\n";
}
construction_logger(construction_logger&& cl) :
val_(cl.val_)
{
std::cout << val_ << " move constructed\n";
}
friend std::ostream& operator << (std::ostream& os, const construction_logger& cl)
{
return os << cl.val_;
}
friend std::istream& operator << (std::istream& is, construction_logger& cl)
{
return is >> cl.val_;
}
};
struct lex_streamer_explicit : boost::static_visitor<std::string>
{
template <class T>
std::string operator()(const T& val) const
{
return lcs(val);
}
template <class T, class V>
std::string operator()(const T& val, const V& val2) const
{
return lcs(val) + '+' + lcs(val2);
}
template <class T, class V, class P, class S>
std::string operator()(const T& val, const V& val2, const P& val3, const S& val4) const
{
return lcs(val) + '+' + lcs(val2) + '+' + lcs(val3) + '+' + lcs(val4);
}
};
struct lvalue_rvalue_detector : boost::static_visitor<std::string>
{
template <class T>
std::string operator()(T&&) const
{
return std::is_lvalue_reference<T>::value ? "lvalue reference"
: "rvalue reference";
}
template <class T, class V>
std::string operator()(T&& t, V&& v) const
{
return operator()(std::forward<T>(t)) + ", " + operator()(std::forward<V>(v));
}
template <class T, class V, class P>
std::string operator()(T&& t, V&& v, P&& p) const
{
return operator()(std::forward<T>(t), std::forward<V>(v)) + ", " + operator()(std::forward<P>(p));
}
template <class T, class V, class P, class S>
std::string operator()(T&& t, V&& v, P&& p, S&& s) const
{
return operator()(std::forward<T>(t), std::forward<V>(v), std::forward<P>(p)) + ", " + operator()(std::forward<S>(s));
}
};
typedef boost::variant<construction_logger, std::string> variant_type;
void test_const_ref_parameter(const variant_type& test_var)
{
std::cout << "Testing const lvalue reference visitable\n";
BOOST_TEST(boost::apply_visitor(lvalue_rvalue_detector(), test_var) == "lvalue reference");
}
void test_const_ref_parameter2(const variant_type& test_var, const variant_type& test_var2)
{
std::cout << "Testing const lvalue reference visitable\n";
BOOST_TEST(boost::apply_visitor(lvalue_rvalue_detector(), test_var, test_var2) == "lvalue reference, lvalue reference");
}
void test_const_ref_parameter4(const variant_type& test_var, const variant_type& test_var2, const variant_type& test_var3, const variant_type& test_var4)
{
std::cout << "Testing const lvalue reference visitable with multivisitor\n";
BOOST_TEST(boost::apply_visitor(lvalue_rvalue_detector(), test_var, test_var2, test_var3, test_var4)
== "lvalue reference, lvalue reference, lvalue reference, lvalue reference");
}
void test_rvalue_parameter(variant_type&& test_var)
{
std::cout << "Testing rvalue visitable\n";
const auto expected_val = lcs(test_var);
BOOST_TEST(boost::apply_visitor(lvalue_rvalue_detector(), std::move(test_var)) == "rvalue reference");
}
void test_rvalue_parameter2(variant_type&& test_var, variant_type&& test_var2)
{
std::cout << "Testing rvalue visitable\n";
BOOST_TEST(boost::apply_visitor(lvalue_rvalue_detector(), std::move(test_var), std::move(test_var2)) == "rvalue reference, rvalue reference");
}
void test_rvalue_parameter4(variant_type&& test_var, variant_type&& test_var2, variant_type&& test_var3, variant_type&& test_var4)
{
std::cout << "Testing rvalue visitable with multivisitor\n";
auto result = boost::apply_visitor(lvalue_rvalue_detector(), std::move(test_var), std::move(test_var2), std::move(test_var3), std::move(test_var4));
std::cout << "result: " << result << std::endl;
BOOST_TEST(result == "rvalue reference, rvalue reference, rvalue reference, rvalue reference");
}
#ifndef BOOST_NO_CXX14_DECLTYPE_AUTO
#define FORWARD(x) std::forward<decltype(x)>(x)
void test_cpp14_visitor(const variant_type& test_var)
{
std::cout << "Testing const lvalue visitable for c++14\n";
BOOST_TEST(boost::apply_visitor([](auto&& v) { return lvalue_rvalue_detector()(FORWARD(v)); }, test_var) == "lvalue reference");
}
void test_cpp14_mutable_visitor(const variant_type& test_var)
{
std::cout << "Testing const lvalue visitable for c++14 with inline mutable lambda\n";
BOOST_TEST(boost::apply_visitor([](auto&& v) mutable -> auto { return lvalue_rvalue_detector()(FORWARD(v)); }, test_var) == "lvalue reference");
}
void test_cpp14_visitor(const variant_type& test_var, const variant_type& test_var2)
{
std::cout << "Testing const lvalue visitable for c++14\n";
BOOST_TEST(boost::apply_visitor([](auto&& v, auto&& vv) { return lvalue_rvalue_detector()(FORWARD(v), FORWARD(vv)); }, test_var, test_var2)
== "lvalue reference, lvalue reference");
}
void test_cpp14_visitor(const variant_type& test_var, const variant_type& test_var2, const variant_type& test_var3)
{
std::cout << "Testing const lvalue visitable for c++14\n";
auto result = boost::apply_visitor([](auto&& v, auto&& t, auto&& p) { return lvalue_rvalue_detector()(FORWARD(v), FORWARD(t), FORWARD(p)); },
test_var, test_var2, test_var3);
std::cout << "result: " << result << std::endl;
BOOST_TEST(result == "lvalue reference, lvalue reference, lvalue reference");
}
void test_cpp14_visitor(variant_type& test_var)
{
std::cout << "Testing lvalue visitable for c++14\n";
BOOST_TEST(boost::apply_visitor([](auto& v) { return lvalue_rvalue_detector()(v); }, test_var) == "lvalue reference");
}
void test_cpp14_mutable_visitor(variant_type& test_var)
{
std::cout << "Testing lvalue visitable for c++14 with inline mutable lambda\n";
BOOST_TEST(boost::apply_visitor([](auto& v) mutable -> auto { return lvalue_rvalue_detector()(v); }, test_var) == "lvalue reference");
}
void test_cpp14_visitor(variant_type& test_var, variant_type& test_var2)
{
std::cout << "Testing lvalue visitable for c++14\n";
BOOST_TEST(boost::apply_visitor([](auto& v, auto& vv) { return lvalue_rvalue_detector()(v, vv); }, test_var, test_var2)
== "lvalue reference, lvalue reference");
}
void test_cpp14_visitor(variant_type& test_var, variant_type& test_var2, variant_type& test_var3)
{
std::cout << "Testing lvalue visitable for c++14\n";
auto result = boost::apply_visitor([](auto& v, auto& t, auto& p) { return lvalue_rvalue_detector()(v, t, p); },
test_var, test_var2, test_var3);
std::cout << "result: " << result << std::endl;
BOOST_TEST(result == "lvalue reference, lvalue reference, lvalue reference");
}
void test_cpp14_visitor(variant_type&& test_var)
{
std::cout << "Testing rvalue visitable for c++14\n";
BOOST_TEST(boost::apply_visitor([](auto&& v) { return lvalue_rvalue_detector()(FORWARD(v)); }, std::move(test_var)) == "rvalue reference");
}
void test_cpp14_visitor(variant_type&& test_var, variant_type&& test_var2)
{
std::cout << "Testing rvalue visitable for c++14\n";
BOOST_TEST(boost::apply_visitor([](auto&& v, auto&& vv) { return lvalue_rvalue_detector()(FORWARD(v), FORWARD(vv)); }, std::move(test_var), std::move(test_var2))
== "rvalue reference, rvalue reference");
}
void test_cpp14_visitor(variant_type&& test_var, variant_type&& test_var2, variant_type&& test_var3)
{
std::cout << "Testing rvalue visitable for c++14\n";
auto result = boost::apply_visitor([](auto&& v, auto&& t, auto&& p) { return lvalue_rvalue_detector()(FORWARD(v), FORWARD(t), FORWARD(p)); },
std::move(test_var), std::move(test_var2), std::move(test_var3));
std::cout << "result: " << result << std::endl;
BOOST_TEST(result == "rvalue reference, rvalue reference, rvalue reference");
}
#endif // #ifndef BOOST_NO_CXX14_DECLTYPE_AUTO
void run_const_lvalue_ref_tests()
{
const variant_type v1(1), v2(2), v3(3), v4(4);
test_const_ref_parameter(v1);
test_const_ref_parameter2(v1, v2);
test_const_ref_parameter4(v1, v2, v3, v4);
}
void run_rvalue_ref_tests()
{
variant_type v1(10), v2(20), v3(30);
test_rvalue_parameter(std::move(v1));
test_rvalue_parameter2(std::move(v2), std::move(v3));
variant_type vv1(100), vv2(200), vv3(300), vv4(400);
test_rvalue_parameter4(std::move(vv1), std::move(vv2), std::move(vv3), std::move(vv4));
}
void run_mixed_tests()
{
variant_type v1(1), v2(2);
std::cout << "Testing lvalue + rvalue visitable\n";
BOOST_TEST(boost::apply_visitor(lvalue_rvalue_detector(), v1, variant_type(10)) == "lvalue reference, rvalue reference");
std::cout << "Testing rvalue + lvalue visitable\n";
BOOST_TEST(boost::apply_visitor(lvalue_rvalue_detector(), variant_type(10), v1) == "rvalue reference, lvalue reference");
std::cout << "Testing rvalue + lvalue + rvalue visitable\n";
BOOST_TEST(boost::apply_visitor(lvalue_rvalue_detector(), variant_type(10), v1, variant_type(20)) == "rvalue reference, lvalue reference, rvalue reference");
std::cout << "Testing lvalue + rvalue + lvalue + rvalue visitable\n";
BOOST_TEST(boost::apply_visitor(lvalue_rvalue_detector(), v1, variant_type(10), v2, variant_type(20)) == "lvalue reference, rvalue reference, lvalue reference, rvalue reference");
}
void run_cpp14_mixed_tests()
{
#ifndef BOOST_NO_CXX14_DECLTYPE_AUTO
variant_type v1(1), v2(2);
std::cout << "Testing lvalue + rvalue visitable\n";
BOOST_TEST(boost::apply_visitor([](auto&& v, auto&& t) { return lvalue_rvalue_detector()(FORWARD(v), FORWARD(t)); },
v1, variant_type(10)) == "lvalue reference, rvalue reference");
std::cout << "Testing rvalue + lvalue visitable\n";
BOOST_TEST(boost::apply_visitor([](auto&& v, auto&& t) { return lvalue_rvalue_detector()(FORWARD(v), FORWARD(t)); },
variant_type(10), v1) == "rvalue reference, lvalue reference");
std::cout << "Testing rvalue + lvalue + lvalue visitable\n";
BOOST_TEST(boost::apply_visitor([](auto&& v, auto&& t, auto&& p) { return lvalue_rvalue_detector()(FORWARD(v), FORWARD(t), FORWARD(p)); },
variant_type(10), v1, v2) == "rvalue reference, lvalue reference, lvalue reference");
std::cout << "Testing lvalue + rvalue + lvalue visitable\n";
BOOST_TEST(boost::apply_visitor([](auto&& v, auto&& t, auto&& p) { return lvalue_rvalue_detector()(FORWARD(v), FORWARD(t), FORWARD(p)); },
v1, variant_type(10), v2) == "lvalue reference, rvalue reference, lvalue reference");
#endif // #ifndef BOOST_NO_CXX14_DECLTYPE_AUTO
}
void run_cpp14_tests()
{
#ifndef BOOST_NO_CXX14_DECLTYPE_AUTO
variant_type const c1(10), c2(20), c3(30);
variant_type v1(10), v2(20), v3(30);
test_cpp14_visitor(c1);
test_cpp14_mutable_visitor(c1);
test_cpp14_visitor(c2, c3);
test_cpp14_visitor(c1, c2, c3);
test_cpp14_visitor(v1);
test_cpp14_mutable_visitor(v1);
test_cpp14_visitor(v2, v3);
test_cpp14_visitor(v1, v2, v3);
test_cpp14_visitor(std::move(v1));
test_cpp14_visitor(std::move(v2), std::move(v3));
variant_type vv1(100), vv2(200), vv3(300);
test_cpp14_visitor(std::move(vv1), std::move(vv2), std::move(vv3));
#endif
}
int main()
{
run_const_lvalue_ref_tests();
run_rvalue_ref_tests();
run_mixed_tests();
run_cpp14_mixed_tests();
run_cpp14_tests();
return boost::report_errors();
}
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